// mycmd.c
#include <stdio.h>
int Sum(int s, int e)
{
	int result = 0;
	for (int i = s; i <= e; i++)
	{
		result += i;
	}
	return result;
}
int main()
{
	int start = 1;
	int end = 100;
	printf("I will begin\n");
	int n = Sum(start, end);
	printf("running done, result is: [%d-%d]=%d\n", start, end, n);
	return 0;
}
